Perhaps you should try some spelling variations:
theo chieu » theo tieu, ho chieu, theo chu
chieu sach » chinh sach, chiet tach, chieu sang
truong cao » truong dai
thong cong » trong cong, tong cong, thong thong
trung cap » trung tam
tac phan » tac pham, tac phat, cac phan
tai phan » tai thanh, tai phong, tai ngan

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: theo chieu sach - manh ((trung cap) or (truong cao)) thong cong ((tac phan) OR (tai phan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: theo chieu sach - manh ((trung cap) OR (truong cao)) thong cong ((tac phan) OR (tai phan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "theo chieu sach - manh ((trung cap) or (truong cao)) thong cong ((tac phan) OR (tai phan)) tap".
• Adding a wildcard symbol may retrieve word variants: theo chieu sach - manh ((trung cap) or (truong cao)) thong cong ((tac phan) OR (tai phan)) tap*.